Toothbrush



Feb. 9, 1926;

' 1,571,999 I... M. DAVIS TOOTHBRUSH F'iled Nov. 29, 1924 l NVE N TORLZMMEL Patented Feb. 9, 1926.

UNITED STATES PATENT OFFICE.

' ,IJE UEL MORGAN DAVIS, or LONDON, ENGLAND.

TOOTHBRUSH.

Application filed Itovember 29, 1924; Serial No. 752,851.

To all whom it mag comm nt Be it known thatI, LEMUEL MORGAN DAVIS, acitizen of the United States of America, of 10 Prima Road, Stockwell,London, S. W. 9, England, have invented certain new and usefulImprovements in Toothbrushes, of which the following is a specification.V

This invention relates to. tooth-brushes,

and has for its primary object to enable the brush head to. be removedfrom the handle" portion at will, and changed or renewed as may bedesired.

For. this purpose, according to the invention, the stock'portionof thebrush, 1. e. that portion in which the brush head is fixed, is

made detachable from -.the handle-portion and fits slidably in achannelled socket or trough forming a virtual continuation of.

the-length ofthe handle; the stock, which j adapted tobe slid intoposition against a stop by a movement lengthwise: of the socket, beingretained therein by a locking device capable of disengagement at will.

One form of theinvention isillustrated in the accompanyingdrawings,whereinFigure 1, is-a side elevation, partly in section, of the frontportion ofthe brush with the brush-head (which carries 'the' bristles)-of the handle being shewn, and the remainlocked in position, onlytheadjacent part ing part being broken off for the sake of convenience.Figure 2 is a similar view, the brush-head being shewn as partlywithdrawn from, or partly inserted in, position. Figure 3'is a face viewof the brush-head and bristles. Figure L is a cross section on the line1t of Figure 1. Figure 5 is a side elevation, partly in section, of thelocking device, drawn to a larger scale, and Figure 6 is a top plan viewofthe same.

Referring to the drawings, the handle 11 of the tooth-brush is providedwith a forward continuation in the form of a laterallyflanged,fiat-bottomed trough 12 of thin material; the flange 13 at each side ofthe trough being carried round the forward end of the trough as at 14 soas to constitute a stop for determining the position of the brush-head15. Each lateral flange 13 is. inwardly re-curved (see Figure 4) to fitover the correspondingly rounded lateral edge 16 of the brush-head 15;the end flange 14: being similarly recurved to. fit over the roundedfront terminal edge 17 of the head; whilst the head itself has aflatback adapted surface of the brusliliead 15.

to slide over and lit snugly against the bot tom of the trough 12. Inorder to ensure both a tight fit and also easy retraction of the head15', the lateral edges 16, 16 of the {head preferably converge slightly,in the forward direction, as shewn in Figure 3.

The locking device for retaining the brushhead 15 in position ispreferably constituted by a stud 18 (Figures 5 and 6)' which passesthrough, and is adapted both to turn and to slide in, a hole in thehandle 11 (or in the bottom of the trough) immediately beyond the rearend of the head; this stud having at its outer end a thin orflatly-domed head 19 adapted to contact with the back of the trough orhandle without proyecting appreciably from the surface thereof, and atits inner end a radial and slightly elastic 11111 201adapted to overliethe adjacent end of the brush-head and formed with a hooked or nibbedvextremity 21 adapted to snap into engagement with a notch or depression22 on the upper or front \Vhen the brusli-head is to be with-drawn fromits position, the stud 18 isturned so as to free the hooked. or nibbedextremity 21 of the arm 20 from the notch 22, and is then pushed orallowed to drop. through the hole until the arm 20 lies in a recess 23provided for the purpose in the surface of the handle 11; whereupon thebrush-head 15 can be freely slid out of the trough 12, with the bottomof which the upper surface of the radial arm 20 then lies flush (seeFigure 2). The notch 22 may have a leading-in groove (not shewn) tofacilitate the engagement and disengagement of the hook or nib 21 fromthe notch. In order to economize space, the

stud may be received in a half-round notch 24c at the adjacent endo'fthe' brush-head15.

whereof the conjoint span is greater than the diameter of the upper endof the hole;

In order to avoid risk of an edge of the head 19 of the stud, when inits normal or looking position (Figure 1), projecting 11evond 1111 rear51112 111 1 1 111 the handle 11 11nd trough 1.2 in 511111 1111111111 :15to permit of the 11111111 1!) catching against the iipe or gums of 1111user, the head it) is preterahly received, as shown, in 11 1'11151; 213(Figure 5 3) formed on the back of the handle by 11 rounded 1111111111111 1111111111 2? which pro jeets 11"111111 said back as indicated.Moreover, in order to 1111i1i1 111'11 the thorough washingout 111' the1111111215 in which the stud 18 is 111111111111 1 reeeived. that portion29 of the shank which seats: itself in the 111111 is 111111111 111'11111111 1 diameter than the portion to which 1111111111121)i11i111111edi11te1 1 1 11111 111 11. no 111111, when the stud retracted11s in Figure 2. 1111 1111111 "3% is left open tinfougin out virtualiyits entire extent; whilst, in order to guide 11115 portion 251 111'111rger diameter into its 11111111111 position in the hoe, the511111111111 1 between the portions 111? the stud having diii erentdiameters 1111 111111111 11111111 11101 tapering as indieated 111: #111.

it W111 111 ohvions that separate hrnsh 11 11115. 1enpee1ive1v 111rrvi11; various dil 't'erent kinds of hristies (or equivaient 1 1elnents.11111-11 for example as 11111111 1- protuhernnees), 31111 1 1' 1111111191 of the 1111 1 1 111 invention 111 interehangeabiv used with thesame 11111111111; 11 point 111 eonsidernide eon 11 1111 111 11 11nd 1111011111111.111 in certain dental 1 11111 5. 11s 11.11 111111111111 where.owing to 11 septie eondition 111 the 1111111111, 11 is desirable to 1111111111 brush heads termed together with the 11rist1es or equivalentelements of eueh inexpeiisire 1111111 11111 1111 to justity 1111 entire111111111-111 1111 111 11151 thrown away 1 111 11 111111 thei111p1e111en1 need.

'1. A 1:o1'1th-1 11u.- ;11 comprising- :11)1111-.il-11131'111, 1111111111111 5 .1111111111111 1 there'11o111 111111 provided 111' one endwith 1111111111111 side 111111 1 1111 111115 1111111111 11 .uoeketadapted to 1 1111111111 re- 11 111 the 111111111-111 1111, said11111111111 111 1111 pro vided with 11 pertoration adjacent the 1 11 11111111 111 11111 5111 111 1. 111111 11. 1111111 in said per i'oration.5111111 11111 11 11'1l1111l1sillj3: 11 stud 1111111111111 1111111 111turn and to slide in the peritoratioin 11 11- 1111 on the rear end 111?S11111 1111111 1111111111111 to engage the 11111111111 from the rear,and a. spring-11rn1 projecting 1111111111,

1111111 the trout end 111? the stud and adapted spring-111111 projectsradially, said part of F1 11111 1 diameter extending beyond thepertor111ion in the 11111111111 when the 11111111 is in lockingposition.

3. 1'1 tooth-brush comprising 11 hrush- 111 1111 11 11111111111separable tllere'i'roin and pro vided 111'. one end with intunned side111111 end 1'111111 torniing 11 socket adapted to 151111111113 receivethe brush-head. said handle being provided with 11, perforation adjacentthe 1 11111111111 1111 the socket, and 11 latch in 011.111 perforation.said 1111011 comprising 11 stud adapted 1111111 to turn and to 5111111in the perforation, 11 11111111 on the r1111 end of said stud adapted toengage the handte 1"10111 the renr 111111 11 11111i11;r11rn1 projeeting1 1111111113 From the front end 111 the stud and adapted to engage 11depression 1111 the front 11111'111111 111 the hrush head the studcomprising in i1 1 11 1111111 two parts 1:1:1 difi'erent diameter,1111111111 11 part of iareer 11111111111111 next to 1111 111 1111 111the stud 1111111111111 111 1111 the per- 111111111111 in the 1111111111and 11 part 01 5111111101 di11111e1er from which the Spring 111-111projeets radially. 111111 11. tapering portion uniting the two parts ofdilierent dialneter, said part 111 1111 1111111.- 111111111111 1extending 1111 101111 the perforation in the handle when the 1111'111 isin looking position.

1-. A: tooti1-11rus11 11s e111i11ie11i11 111111111 3, wherein the111111111 spring-111111 torined with 111101111 extensions adapted toprevent eonipiete retrartioii 01 [1111 1.111111 from 11111 per oration111 the handle.

51. A, t1i111th-11r11s11 11s 111111111111 in 111111111 1,, wherein thebrush-head 11111: its 1111111111 edges 1111 111111 111111'11rge11tin theilforward. direction, and the inturned 511111 w1111s 111 the 11111 11111 on the 11111111111 are eorrespondi11111 1 convergent to it saidlateral edges, s1111- 11111111111111 as described.

111 111117 11111 Mt KHAN 11111 1 S.

